Slide valve



May 13, 1952 SLIDE VALVE Filed Nov. 10, 1944 Patented May 13, 1952 SLIDE VALVE James E. McGovney, Cranford, N. 3., assignor to Standard Oil Development Company, a corpo-- ration of Delaware Application November 10, 1944, Serial No.

1 Claim. (01. 251 51 This invention relates to a valve for the handling-of finely divided solids, and in particular to a slide valve for handling fluidized solids.

' One of theoutstanding developments of recent years in the petroleum industry is the application of the fluid-solids technique to the catalytic cracking of hydrocarbon oils. In such processing, a solid, usually a material of siliceous nature, is finely divided and suspended in a gas and movement of the 'gas solids dispersion is made effective by means similar to those for controlling the movement of fluids. In fact, the movement of such gas-solids dispersions closely approximates the hydrostatic behavior of liquids. The passage of gas-solids dispersions through equipment, and especially through piping in the restricted parts such as the valves, causes undue erosion. This erosion occurs not only in the valves but also in the piping or other equipment immediately downstream from the valves. The present invention relates to the development of a valve in which the erosion feature of the passage of a gas-solids dispersion is minimized by reason of its particular design.

It has been found that the erosive action upon downstream equipment of fluidized solids in passing through a valve can be reduced by controlling the flow through the valve in such a manner that the stream is directed toward the center of the downstream equipment. This efiect has been found to occur advantageously when the port or inlet opening in the body of the valve was made circular, and particularly advantageously when that opening was eccentrically disposed with regard to the center line of the valve. The particular advantage in having the port eccentrically disposed is in regard to controlling the flow when the valve is only partly opened. In this manner, the flow from the valve is made to occur at an angle to the center line of the valve. As a means of effecting a further improvement, the working end of the slide portion of the valve has been designed to have a recessed contour. A valve of this general design has been found to be effective in minimizing the erosive action upon downstream equipment of fluidized solids after passing through the valves. This advantageous effect has been noticed particularly when two valves of this general design are used in series. The materials of which the valve may be constructed are any of those usually employed in the construction of conventional valves at present employed in the handling of finely divided solids.

The valve design of this invention is therefore one in-which the body has a circular port or inlet opening preferably eccentrically disposed with regard to the center line'of the body. The slide portion of the valve has a recessed contour,

preferably semi-circular, in the end opposite to the stem attachment by.,-which the movement of the slide upon the valve seat may be externally controlled.

In order that the invention may be more thoroughly understood, the following description and illustration as presented in Figures 1 and 2 are given.

Figure 1 is a cross-sectional view of the valve in elevation showing particularly the eccentric character of the opening in the seat of the valve. Figure 2 is a plan view of the valve.

In Figure l, the valve is shown as having a conical portion l0 terminated in its small end by a circular opening or seat l2. This circular opening is eccentrically disposed with regard to the center line IA of the valve connection to the downstream equipment. Directly beneath the seat opening I2 is the slide l6 having sliding contact with the underside of the seat opening l2. The slide I5 is operated in its motion to and fro with regard to the valve opening I2 by means of the shaft 18 connected to an external means, not shown, for moving the shaft in a longitudinal direction. The shaft H3 is shown as passing through the valve supporting parts 20 and 22. In the plan view shown in Figure 2, the slide I6 is shown as having a semi-circular opening 24 beneath the seat opening l2. As is indicated by the drawings, the slide I6 is so disposed in the body portion that when operated to close the opening or orifice l2 closure is accomplished from the side of the orifice farthest from the center line of the part 22. Also, in the structure 11- lustrated, a line extended longitudinally through the center of the valve will intersect the perimeter of the orifice l2 at a point farthest removed from the center line of the part 22, and will also intersect the center line of both the element [0 and the part 22.

The design of the valve of this invention is therefore in contrast to the design of conventional valves employed in the handling of finely divided solids. The design. of conventional valves involves a centered rectangular opening and a square-edged slide operating upon the valve seat. Such features in conventional valves caused the flow of the finely divided solids to be partly directed against the sides of the downstream equipment and thereby cause undue erosion of the equipment. The design of the valve of this invention reduces such disadvantageous efiects of flow so that, even when the valve is partly opened for throttling, the flow through the restricted area is directed toward the center of the piping or other downstream equipment. Moreover, the, erosion on the working parts of the valve is concentrated where it least affects the operation of the valve.

What is claimed is:

A valve structure, comprising a valve body having substantially coaxial inlet and outletportions, a transverse partition separating said portions, a passageway of smaller diameter thanfthe outlet portion extended through said partition in eccentric relation to the common axis of said inlet and outlet portions, and in peripherally,

extendedcoaxially throug Said partition passageway to" terminate" within said valve outlet portion "in longitudinally spaced relation tosaid partition, said extension portion providing for substantiallystraightline flow into said outlet portionand a slide; valve member disposed within'said valve outlet'portion, for movement trans- REFERENCES CITED The following references are of record in the l Of, h s ti nl? T'JN rEii STATES PATENTS Number Name Date 909,921 'Markman Jan. 19, 1909 1,058,982 Slige'r; Oct. 29, 1912 1,311,332 Edwards July 29, 1919 1,488,229 Burns Mar. 25, 1924 5-13-2 0 111 Ja 9 9 Mar.- 14,1933 1,999,921 Burlghardt b .30,1j9 5 1 w??? anes". May I 1935 FOREIGN PATENTS- Number Country Date "28,788 GreatBritain, ofjls a 443,471 France; of 1912 567,185 Germany, of, 1932 626,450v 

